Deadly spleen cancer in dogs. Life Expectancy of Dogs with Spleen Cancer. Ruptured spleen tumors typically cause severe bleeding and rapid death, due to blood-filled nature of the spleen itself. Unfortunately, spleen cancer in dogs has a very poor prognosis, with many dogs only being able to live for a few months after being diagnosed. If the splenic tumor has not ruptured then surgical removal of the spleen is needed in most cases to determine whether the tumor is benign or malignant. A ruptured spleen is typically caused by a blow to the left upper abdomen or the left lower chest, such as might happen during sporting mishaps, fistfights and car crashes. Tumors on the spleen can be benign or cancerous. Sometimes, dog owners don’t realize their pets have the cancer until they suddenly pass away without warning. Unfortunately, a more rare diagnosis of Hemangioma is made by biopsy in less than 1/3 of these cases. In about three quarters of these cases, a ruptured spleen or liver mass is diagnosed as Hemangiosarcoma. Without treatment, dogs with lymphoid tumors have a life expectancy averaging ten weeks but a few live for six to twelve months. Spleen tumors in dogs can be either benign or malignant, though both types of tumors are dangerous, because they could rupture at a moment's notice. A spleen can rupture due to: Injury to the left side of the body. Symptoms of a Ruptured Spleen in Dogs Spleen ruptures in dogs may be spontaneous due to trauma from being hit by a car or from a penetrating wound. Can Vet J 2016;57:842-846. This benign, slow growing tumor on dogs is cured by surgery. Treatment involves removing the spleen, but even with treatment affected dogs rarely live more than a few months. These tumors are at risk for rupture and leakage of blood into the abdomen. Lumps in the Spleen of Dogs Hemangiosarcoma of the spleen is the most common cancer of the spleen in dogs. The spleen can usually be removed with almost no problems; however, life– threatening. The life expectancy of course depends on whether the cancer has spread and if … Read more about the spleen: Cancer in the Spleen of Dogs. If a tumor is found on the spleen but is not yet bleeding into the abdomen, the chance of the tumor being cancerous is about 50/50. Your dog can live without his spleen, however. There are only limited treatment options. It may also be a very slow process were the owner notices symptoms of spleen rupture in dogs under the form of lethargy, inappetence, weakness and an abdomen that appears to be distended . Spleen Cancer in Dogs. Survival with the intestinal form averages only eight weeks. If the tumor hasn't ruptured, the dog's abdomen might appear distended and he appears lethargic. Ruptured tumors can cause excessive bleeding in the abdomen and some cases, acute death can occur. 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